python错误之RuntimeError: dictionary changed size during iteration

pythonn报错信息：

C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\python.exe C:/Users/Administrator/PycharmProjects/pythondemo/maptest.py
Traceback (most recent call last):
  File "C:/Users/Administrator/PycharmProjects/pythondemo/maptest.py", line 5, in <module>
    for line in maps.keys():
RuntimeError: dictionary changed size during iteration

python2中实现遍历的同时删除字典中的元素；python3中运行报错信息：

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C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\python.exe C:/Users/Administrator/PycharmProjects/pythondemo/maptest.py Traceback (most recent call last):   File "C:/Users/Administrator/PycharmProjects/pythondemo/maptest.py", line 5, in <module>     for line in maps.keys(): RuntimeError: dictionary changed size during iteration

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# maps = {1:"李明",2:"丹尼"} # for line in maps.keys(): #     if(line == 2): #         maps.pop(line) # print(maps)

　　

python3中实现遍历的同时删除字典中的元素

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maps = {1:"李明",2:"丹尼"} for line in list(maps.keys()):     if(line == 2):         maps.pop(line) print(maps)